Pneumatic grease gun



June 11, 1929. R. J. GRAY 1,717,024

PNEUMATIC GREASE GUN Filed Jan. 14, 1927 3 Sheets-Sheet l Fig f1 104 fli-torneys June 11, 1929. R. J. GRAY 1,717,024

' PNEUMATIC GREASE GUN Filed Jan. 14, 1927 5 Sheets-Sheet 2 Willi l2 (7 I V Inventor:

R J. Gray.

fitter-megs.

June 11, 1929.

R. J. GRAY PNEUMATIC GREASE GUN Filed Jan. 14, 1927 3 3 Sheets-Sheet MEL-Am my I I I I n veni-or: R J Gra K? tor-neys.

on the frame.

Patented June 11, 1929.

r ;:saorrr nussnnr. J. GRAY, or

MINNEAPOLIS, .MINNESO'IA, ASSIGNDR T0 GRAY COMPANY, INC, OF MINNEAPOLIS, MINNESOTA.

PNEUMATIC, GREASE o-Un.

Application filed January 14-, 1927. Serial No. 161,128. I

M y invention relates to pneumatic grease guns. An object is to provide a device of this characterbymeans of which grease for lubricating purposes may be effectively delivered. While intended more particularly for use in lubricating parts of motor vehicles it will be obvious that there are other places where my device maybe used to advantage for obtaining efficient and timely lubrication of moving parts.

The full objects and advantages of my invention will appear in Connection with the detailed description thereof, and the novel features of my inventive idea will be particular y pointed out in the claims.

In the accompanying drawings which illustrate a practical embodiment of my invention, A

Fig. 1 is a side elevational view of the device. Fig. 2 is a top plan view. Fig. 3' is a view in vertical longitudinal section. Fig

a view in vertical section through a control valve showing it in open posltlon. Fig.

' a is a similar view but showing the valve in 'wheels and for this purpose an axle 2O is bolted to the lower margin of the member 18 and the ends of the axle are provided with wheels 22 and 24. Furthermore, to the member 18 is secured a forwardly extending frame 26 in which is swivelly mounted a fork 28 on the lower end of which a wheel 30 is rotatably mounted. A handle is pivotally attached to the front end of the frame for moving the device into the desired position. A tool box 34: is mounted A tubular member 36 is positioned in the receptacle 10 with its lower end extending through the shelf 16 and provided with a nut 38 for holding the tubular "member in place.

member at its upper end is enlarged to receive an upwardly opening check valve 40 normally held on its seat by a spring 4:2 in- 'terposed between the valve and a screw plug ends of the two pipe sections.

The bore of the tubular is screwed into a pipe section 48, a packin O gland beingprovided for the engaged The pipe section 48 extends through the wall of the re ceptacle 10 and its outer end is connected by a screw threaded coupling'52 with a socket member 5a which receives the ball-like end 56 of a pipe section 58 to the outer end of which is attached a flexible tube 60 for delivering the greaseto the desired: place. The socket member 54: contains a spring 62 which holds the ball member 56 firmly but adjustably in contact with the reduced outer end of the socket member. The wall of the hollow member 36 is providedwith a perforation ()llocatedjust above the bottom of thereceptacle 10. A cylinder 66 is held between the shelf 16 and a head 68 secured in place by rods 70 shown in Fig. 7. A pisten 72 works in the cylinder 66 and this pis-,

ton carries an upwardly extending rod .74

constituting a plunger which works in the bore of the hollow member 36. The piston 72 and attached plunger 74- are normally held in lowered position by a coiled spring 76. The wallof the cylinder near its upper end is provided with a perforation 78 for escape of air when the piston is raised in the manner now to be described. The head 68 is provided with a perforation to which is, fitted an elbow 80 having a flexible tube 82 attached thereto. The other end of the flexible tube 82- is attached. to a valve casing 84: to which is also attached a flexible tube 86 leading from any convenient source of com pressed air. A stem 88 is slidably mounted in the valve casing 84 and extends through the upper, wall thereof, the valve chamber being closed at the bottom by a screw plug 90. Secured to the lower end of the stem. 88 is'a valve 92 adapted to cooperate with a valve seat 9-1 so that when the valve is closed as shown in llig. at, compressed air is pre vented from passing from the tube 86 into the stem may be slid up and down.

100 formed in the casing. The valve 98 terminates in a button 102 by means of which When the stem is in the position shown in Fig. 4,

con'ipressed-air in the tube82 is permitted The sides of to escape past the valve 98. the receptacle 10 are provided with hooks 10% upon which the flexible tubes may be hung when not'in use.

The operation and'advantages of my invention will be readily understood in connection with the foregoing description. hen the device is to be used, the delivery tube 60- is attached to the placewhich is to be lubricated The valve stem "is then moved from the-position shown in Fig. 4 into that 7 shown in Fig. 5 so that compressed v air passes through the tube 82 and lifts the piston 72 and attached plunger 74. The hit terforces the grease which is in the tubular member 36 past the check valve 40 and through the delivery tube 60. When the stem is moved back into the position shown in J Fig. 4:, the supply ot compressed air which was delivered into the tube82'is shut ofi" and the pressure therein is relieved through the slots in the stem past the valve 98. The

spring 76 now. forces the piston and attached 1. A pneumaticgrease gun comprising a hollow supporting member, a main grease receptacle mounted on theupper end ofsaid ceptacle, a cylinder'in said. hollow member extending down from the bottom of said receptacle, piston working in said cylinder, an upwardly extending rodlike plunger secured to said piston and Working in saidtubular member, a delivery tube extending from the upper end of said tubular member, said tubular member havinga perforation 111 its wall a'dJacent the bottom of said re ceptacle, a spring in said cylinder normally 1 iol ding said piston and plunger in lowered position, and a tube for supplying compressed air to the lower end of said cylinder.

2. A pneumatic grease gun comprising a hollow supporting member, a main grease receptacle mounted on the. upper end of'said hollow member, a detachable cover for the upper end of said receptacle, a tubular member extending up from the bottom of said re ceptacle, cylinder in said hollow member extending down from the bottom of said reeeptacle,'a. piston working in said cylinder, an upwardly eirtending rodlike plunger secured to said piston and working in said tubular member, a delivery tubeextending from the upper end of said tubular member out through the side wall of said main receptacle, said tubular member having a perforation in its ,wall adjacent the bottom of said receptacle, a spring in said cylinder normally holding said piston and plunger in lowered position, and a tubelor supplying compressed. air to the lower end of said cylinder.

In testimony whereof I hereunto aflh: my

signature.

RUSSELL J. GRAY. 

